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Golf ball size chunks placed in tunnels will displace the air as it sublimates, and because it is heavier than air, it will penetrate into the deepest tunnels where the pups are likely to be. The critters will asphyxiate. That's a theoretical 100% kill rate. Local producers typically sell chunks in the range of 8 to 10 pounds, at $1 to $1.50/pound. It will keep all day in a good Styrofoam cooler. A small block is about the size of a thick phone book.

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13y ago

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